Determination of the Rotational and Vibrational Constants of Photolytically Generated CF Radicals by REMPI Measurements

Wollbrandt, J.; Roßberg, M.; Strube, W.; Linke, E.

doi:10.1006/jmsp.1996.0100

Cited by 6 publications

(5 citation statements)

References 4 publications

(5 reference statements)

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“…(2). Transitions to the electronically excited A 2 ⌺ ϩ , D 2 ⌸, B 2 ⌬, and a 4 ⌺ Ϫ states have been reported in previous studies (3)(4)(5)(6)(7)(8)(9). The A 2 ⌺ ϩ 4 X 2 ⌸ electronic system was observed in emission (3)(4)(5), REMPI (6), and direct absorption experiments (7).…”

supporting

confidence: 54%

“…The resulting band origin positions are compared to the values calculated from Refs. (3,6). These are systematically off by Ϫ0.2 to Ϫ0.5 cm Ϫ1 , which is probably due to the increasing anharmonicity for higher vibrational levels.…”

mentioning

confidence: 93%

“…The A 2 ⌺ ϩ 4 X 2 ⌸ electronic system was observed in emission (3)(4)(5), REMPI (6), and direct absorption experiments (7). Accurate information on the ground state vibrational progression (up to vЉ ϭ 12) is available from REMPI experiments on the D 2 ⌸ 4 X 2 ⌸ electronic system (6,8). The B 2 ⌬ 4 X 2 ⌸ system was studied in emission (9) and the weak and spin-forbidden a 4 ⌺ Ϫ 4 X 2 ⌸ was reported in Ref.…”

mentioning

confidence: 99%

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The A2Σ+ ← X2Π Transition of CF Starting from Highly Excited Vibrational States

Courrèges-Lacoste

Sprengers

Ubachs

et al. 2001

Journal of Molecular Spectroscopy

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supporting

confidence: 54%

mentioning

confidence: 93%

mentioning

confidence: 99%

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The A2Σ+ ← X2Π Transition of CF Starting from Highly Excited Vibrational States

Courrèges-Lacoste

Sprengers

Ubachs

et al. 2001

Journal of Molecular Spectroscopy

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“…The ground state constants have been determined in several studies. 12,24,25 The most recent by Wollbrandt et al 12 includes vibrational levels up to vЉϭ12. Wollbrandt et al also determined the D 2 ⌸ state constants up to vЈϭ6 in the same experiment.…”

Section: ͑4͒mentioning

confidence: 99%

“…2,6 -9 The A 2 ⌺ ϩ -X 2 ⌸ and B 2 ⌬ -X 2 ⌸ bands have been the subject of many studies because they are located between 195 and 235 nm, where experimental work is easily accessible. Two-photon excitation processes on the CF D 2 ⌸ -X 2 ⌸ bands [10][11][12] have facilitated the study of part of the vacuum ultraviolet. Johnson and Hudgens 10 mention that no other bands are observed in the CF D 2 ⌸ -X 2 ⌸ spectral region, even though transitions to the C (2 2 ⌺ ϩ ) and CЈ 2 ⌺ ϩ states, identified by White et al, 13,14 should be detectable.…”

Section: Introductionmentioning

confidence: 99%

Broadband absorption and ab initio results on the CF C 2Σ+–X 2Π system

Luque

Hudson

Booth

et al. 2003

The Journal of Chemical Physics

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Radiative and predissociative lifetimes of the A 2 Σ + state (v ′ =0,1) of SH and SD: A highly correlated theoretical investigation Broadband absorption spectra and ab initio calculations are combined to complete and reinterpret part of the vacuum ultraviolet spectra of the CF radical. We have found a new band at 190.8 nm which we have assigned to the CF C 2 ⌺ ϩ -X 2 ⌸ ͑1,0͒ transition. Ab initio calculations show that the band at 186.6 nm formerly assigned as CF CЈ 2 ⌺ ϩ -X 2 ⌸ ͑0,0͒ by White et al. ͓J. Mol. Spectrosc. 75, 318 ͑1979͔͒ corresponds to the CF C 2 ⌺ ϩ -X 2 ⌸ ͑2,0͒ band. The CF C 2 ⌺ ϩ state is heavily perturbed by the A 2 ⌺ ϩ state and by repulsive 2 ⌺ ϩ states. The observed predissociation pattern for the C 2 ⌺ ϩ (vЈϭ0,1,2) states is well reproduced by the calculations. Information on the CF C 2 ⌺ ϩ -X 2 ⌸ and D 2 ⌸ -X 2 ⌸ electronic transition moments and corresponding oscillator band strengths is also presented.

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CF A 2Σ+–X 2Π and B 2Δ–X 2Π study by broadband absorption spectroscopy in a plasma etch reactor: Determination of transition probabilities, CF X 2Π concentrations, and gas temperatures

Luque¹,

Hudson²,

Booth³

2003

The Journal of Chemical Physics

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Broadband absorption spectroscopy was applied to study the CF A 2Σ+–X 2Π and B 2Δ–X 2Π transitions in a plasma etch reactor. We report a previously unobserved band, which is assigned as CF A 2Σ+–X 2Π (3,0). This band is significantly broadened by predissociation, and we estimate the average collision-free lifetime of the CF A 2Σ+ v′=3 level to be 0.30±0.08 ps. Experimental relative oscillator strength measurements, together with ab initio calculations, Rydberg–Klein–Rees-based wave functions and experimental lifetimes were used to calculate a full set of transition probabilities for the CF A 2Σ+–X 2Π and B 2Δ–X 2Π bands. The maximum observed number densities of CF X 2Π were ∼2×1013 cm−3 with sensitivity to measure to 1010 cm−3. The excited state and ground state temperatures were determined by comparing the spectra to simulations. The ground state rotational temperature was 450±30 K and the vibrational temperature was 850±80 K near the substrate surface. The CF B 2Δ excited state rotational temperatures are higher than those of the ground state. We show that this absorption technique is practical for determining gas temperatures and absolute concentrations in plasma etch reactors.

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Determination of the Rotational and Vibrational Constants of Photolytically Generated CF Radicals by REMPI Measurements

Cited by 6 publications

References 4 publications

The A2Σ+ ← X2Π Transition of CF Starting from Highly Excited Vibrational States

The A2Σ+ ← X2Π Transition of CF Starting from Highly Excited Vibrational States

Broadband absorption and ab initio results on the CF C 2Σ+–X 2Π system

CF A 2Σ+–X 2Π and B 2Δ–X 2Π study by broadband absorption spectroscopy in a plasma etch reactor: Determination of transition probabilities, CF X 2Π concentrations, and gas temperatures

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